DESCRIPTION

The UTC M54133A is a semiconductor integrated circuit developed for use in high-speed earth leakage breakers incorporating functions to protect against voltage surges and inverter noise.

FEATURES

* Improvement of ability against unwanted tripping by lightning-surge and lightning impulse.

   Two times counting system adopted.

* Improvement of ability against unwanted tripping by inverter-noise.

   Built-in operational amplifier (of low current dissipation) for active low-pass filter.

   Improved high-frequency, high harmonic superposition performance

* Internal time delay function

* An external capacitor is used to set the delay time.

* High input sensitivity: VT=11.5mVrms Typ.

* Low-current dissipation (at RIREF=180kΩ)

   In stand-by condition: IS=610μA Typ.

* High stabilities design

   Adopt the circuits that is not affected by fluctuations of supply voltage/ambient temperature.